RecoverableErrorReportingContext::RecordConstraintError Method
Records a constraint error that occurred when attempting to apply a change to an item. Used to describe a local item that is in a constraint conflict with the change.
Assembly: Microsoft.Synchronization.SimpleProviders (in Microsoft.Synchronization.SimpleProviders.dll)
| Exception | Condition |
|---|---|
| ChangeDeferredByProviderException | The change being applied was deferred by the provider until the next synchronization session as a result of the constraint conflict. |
| SimpleProviderInvalidOperationException | There were multiple constraint errors, a constraint error was reported on an object that is no longer valid, or the constraint error policy does not allow constraint errors to be recoverable. |
The change will be reapplied or resolved later in the synchronization session. For more information about constraint conflicts, see Handling Conflicts for Simple Providers.
The following code example shows an implementation of the InsertItem method that applies inserts to an in-memory sample data store. The method records a constraint error if the insert cannot be applied. To view this code in the context of a complete application, see the "Sync101 using Simple Sync Provider" application that is available in the Sync Framework SDK and from Code Gallery.
public override void InsertItem(object itemData, IEnumerable<SyncId> changeUnitsToCreate, RecoverableErrorReportingContext recoverableErrorReportingContext, out ItemFieldDictionary keyAndUpdatedVersion, out bool commitKnowledgeAfterThisItem) { ItemTransfer transfer = (ItemTransfer)itemData; ItemData dataCopy = new ItemData(transfer.ItemData); // Check for duplicates, and record a constraint error if a duplicate is detected. if (!_store.Contains(transfer.Id)) { _store.CreateItem(dataCopy, transfer.Id); keyAndUpdatedVersion = _store.CreateItemFieldDictionary(transfer.Id); } else { recoverableErrorReportingContext.RecordConstraintError(_store.CreateItemFieldDictionary(transfer.Id)); keyAndUpdatedVersion = null; } commitKnowledgeAfterThisItem = false; }
Public Overrides Sub InsertItem(ByVal itemData As Object, ByVal changeUnitsToCreate As IEnumerable(Of SyncId), ByVal recoverableErrorReportingContext As RecoverableErrorReportingContext, ByRef keyAndUpdatedVersion As ItemFieldDictionary, ByRef commitKnowledgeAfterThisItem As Boolean) Dim transfer As ItemTransfer = DirectCast(itemData, ItemTransfer) Dim dataCopy As New ItemData(transfer.ItemData) ' Check for duplicates, and record a constraint error if a duplicate is detected. If Not _store.Contains(transfer.Id) Then _store.CreateItem(dataCopy, transfer.Id) keyAndUpdatedVersion = _store.CreateItemFieldDictionary(transfer.Id) Else recoverableErrorReportingContext.RecordConstraintError(_store.CreateItemFieldDictionary(transfer.Id)) keyAndUpdatedVersion = Nothing End If commitKnowledgeAfterThisItem = False End Sub